// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.apache.doris.nereids.trees.expressions.functions.scalar;

import org.apache.doris.catalog.FunctionSignature;
import org.apache.doris.nereids.exceptions.AnalysisException;
import org.apache.doris.nereids.trees.expressions.ArrayItemReference;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.functions.ExplicitlyCastableSignature;
import org.apache.doris.nereids.trees.expressions.functions.PropagateNullable;
import org.apache.doris.nereids.trees.expressions.shape.UnaryExpression;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.ArrayType;
import org.apache.doris.nereids.types.DataType;
import org.apache.doris.nereids.types.LambdaType;
import org.apache.doris.nereids.types.coercion.AnyDataType;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;

import java.util.List;

/**
 * ScalarFunction 'array_sort'. This class is generated by GenerateFunction.
 */
public class ArraySort extends ScalarFunction
        implements UnaryExpression, ExplicitlyCastableSignature, PropagateNullable {

    public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
            FunctionSignature.retArgType(0).args(ArrayType.of(AnyDataType.INSTANCE_WITHOUT_INDEX)),
            FunctionSignature.ret(ArrayType.of(AnyDataType.INSTANCE_WITHOUT_INDEX)).args(LambdaType.INSTANCE)
    );

    /**
     * constructor with 1 argument.
     */
    public ArraySort(Expression arg) {
        super("array_sort", arg);
    }

    /** constructor for withChildren and reuse signature */
    private ArraySort(ScalarFunctionParams functionParams) {
        super(functionParams);
    }

    @Override
    public void checkLegalityBeforeTypeCoercion() {
        if (children.get(0).getDataType() instanceof ArrayType) {
            DataType argType = child(0).getDataType();
            if (argType.isArrayType() && (((ArrayType) argType).getItemType().isComplexType()
                    || ((ArrayType) argType).getItemType().isVariantType()
                    || ((ArrayType) argType).getItemType().isJsonType())) {
                throw new AnalysisException("array_sort does not support types: " + argType.toSql());
            }
        }
    }

    /**
     * withChildren.
     */
    @Override
    public ArraySort withChildren(List<Expression> children) {
        Preconditions.checkArgument(children.size() == 1);
        return new ArraySort(children.get(0));
    }

    @Override
    public DataType getDataType() {
        if (children.get(0) instanceof Lambda) {
            Lambda lambda = (Lambda) children.get(0);
            ArrayItemReference argRef = lambda.getLambdaArguments().get(0);
            Expression arrayExpr = argRef.getArrayExpression();
            ArrayType arrayType = (ArrayType) arrayExpr.getDataType();
            return ArrayType.of(arrayType.getItemType(), true);
        } else if (children.get(0).getDataType() instanceof ArrayType) {
            Expression arrayExpr = children.get(0);
            ArrayType arrayType = (ArrayType) arrayExpr.getDataType();
            return ArrayType.of(arrayType.getItemType(), true);
        } else {
            throw new AnalysisException("The first arg of array_sort must be lambda or array");
        }
    }

    @Override
    public boolean nullable() {
        if (children.get(0) instanceof Lambda) {
            return ((Lambda) children.get(0)).getLambdaArguments().stream()
                    .map(ArrayItemReference::getArrayExpression)
                    .anyMatch(Expression::nullable);
        } else {
            return child(0).nullable();
        }
    }

    @Override
    public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
        return visitor.visitArraySort(this, context);
    }

    @Override
    public List<FunctionSignature> getSignatures() {
        return SIGNATURES;
    }
}
